Automatic coal feeder and stoker



(No Model.) 2 Sheets-Sheet 1.

W. OEHLSTROM. AUTOMATIO GOALPBEDER AND STOKER.

' N0. 489,542. Patented Jan. 10, 1893.

I II 'I II [I INVENTURL 2 SheetsSheet 2.

(No Model.)

, W. OE I-I-LSTROM. AUTOMATIG GOAL FEEDER AND STOKER. No. 489,542.

TIL

.////////A7//A w ,//////u I UNITED STATES PATENT OFFICE.

WVILLIAM OEHLSTROM, OF CLEVELAND, OHIO.

AUTOMATlC COAL FEEDER AND STOKER.

SPECIFICATION forming part of Letters Patent No. 489,542, dated January10, 1893.

Application filed September 9, 1892. Serial No. 445,470. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM ()EHLSTROM, a citizen of the United States,residing at Cleveland, in the county of Ouyahoga and State of Ohio, haveinvented a certain new and Improved Automatic Goal Feeder and Stoker, ofwhich the following is afull, clear, and exact description.

My improved coal feeder or stoker for furnaces, in which the graterelates to detachable, perforated bars with hoods, operating conjointlyand automatically with a hopper arranged at the front of the furnace;said hopper having a series of tubes connected thereto for the inductionof air from the exterior.

The object of my improvement is to provide means by which the fuel in afurnace may be quickly kindled, automatically replenished, easily freedfrom non-combustible elements and which, when ignited, shall consume itsown smoke.

That my invention may be seen and fully understood by others, referencewill be had to the following specification and annexed drawings forminga part thereof, in which Figure 1 is a front view of my device; Fig. 2,a top View and Fig. 3, a longitudinal, vertical section of the same.

Similar letters of reference designate like parts in the drawings andspecifications.

The furnace A, rests on the floor or foundation B, Figs. 1 and 3 and isprovided with the detachable grate bars 0. The bars 0, are supported attheir forward ends by the triangular shaped rod D, Figs. 1 and 3, theupper angle of which is received into a notch 0, Fig. 3, in the sides ofeach bar. Below the rod D, and supporting the rear ends of the bars 0,is the cam-shaft E, of essentially the form shown in Fig. 3. In the bars0, are the slits F and the openings F, a sectional view through both theslits and openings being shown in Fig. 3. Over each of the openings F isa hood G, one of which is removed in Fig. 2, thereby bringing theopening below into view. The sides of the slits F and the curved sidesof the openings F are inclined forward the better to facilitate theentrance of air into the fire-place. The inclined sides of the slits Falso prevent the fuel from falling through said slits. The hoods G, notonly serve to cover the openings F, thereby preventing small pieces ofcoal from falling through or clogging said openings, but they preventthe fuel from passing at once to the lower ends of the grate bars C.Between the lower ends of the bars 0 and the bridge wall H, is the ashgrate I, Figs. 2 and 3, which receives the non-combustible properties ofthe fuel consu med on the bars 0. The ash grate I is turned over todischarge its contents, by means of a suitable lever or shaker appliedto the end of the bearing rod 1, Fig. 2.

Attached to the front of the furnace A, is the bin J, having securedthereto the guides or Ways K and K. Supported and guided by the ways Kand K, is the hopper L, its rear end resting upon the bars 0. The hopperL is provided on its under side with the two brackets H and M, Figs. 1and 3 and with a series of tubes N, Figs. 2 and 3, piercing the rearsupport of said hopper. The tubes Nadmit air directly from the exteriorto the interior of the furnace. The hopper L is placed on the same anglewith the barsO and its roof or upper part, when said hopper is inposition, becomes the floor of the bin J.

To the upper face of the furnace A are secured the bearings O, whichsupport the crankshaft0,said shaft being revolved by the pulley P. Thecrank Q, at the end of the shaft 0, is connected, by means of the rod Q,to the lever B. The lugs S, attached to the lower part of the furnace,support the crank-shaft S and on opposite ends of said shaft are theratchet wheelsTand T. The bifurcated end of the lever B, is attached tothe shaft S and embraces the ratchet T. To the lever is pivoted the pawlU, engaging the ratchet T,best shown in Fig. 3. The ratchet T, Figs. 1and 2 is controlled by the pawl U and is for the purpose of preventingback-lashing by the shaft S. By means of the above described mechanism,it will be readily seen that, by revolving the shaft 0, the shaft S isrotated, for the purpose hereinafter described.

Attached to the crank a, on the shaft S, midway between the walls of thefurnace A, is the rocker-arm V, Figs. 1 and 3, having the elongated slotV and the cross-piece V at the top. The guide bar W, Figs. 1 and 3,projects from the plate W, (said plate being bolted to the face of thefurnace,) and is received into the slot V. In front of the rocker-arm Vand attached to each side of the guide bar 7, are the anti-frictionrolls X, Figs. 1 and 3. As the arm V is rocked back and forth 011 thebar IV, by the rotation of the shaft S, the cross-piece V alternatelycomes in contact with the brackets M and M and thereby forces the backof the hopper L, in and out of the fire-place. The motion imparted tothe hopper L, by the rocker-arm V, causes the fuel in the bin J toslowly slide through the opening J, Fig. 3, onto the gratebars C and inthis manner the fire thereon is fed automatically. The rod Y connectsthe crank Z), on the shaft S between the lug S and the lever R, with acrank on the end of the cam-shaft E. When the shaft S is rotated, arocking motion is imparted to the cam-shaft E, since the crank on saidcamshaft is longer than the crank on the shaft S, and the cams E raiseand lower each alternate bar 0.

Below the grate-bars C, is the floor Z, Figs. 1 and 3, resting onsuitable supports and forming an air chamber which is closed at thefront after the tire is started, by the doors Z. \Vhen the doors Z areopen, air enters the space above the floor Z and passes through theslits F, openings F, and is projected onto the fire by the hoods G. Inthis manner a strong draft is obtained, which quickly kindles the fire.The air introduced into the fire-place, by the tubes N, drives thecarbonaceous properties of the smoke back into the fire, whence theycame, to be consumed and carries the gases into the heating chamber II,Fig. 3, where combustion takes place and all the elements capable ofgenerating heat are utilized. The space between the foundation B and thefloor Z, is open and communicates with the chamber H, through holes inthe wall H.

The connection of the rod Q with the lever B may be adjusted by means ofthe pin 0, Fig. 3, and the holes in said lever. The

rod Q, may be detached from the lever R and said lever may be operatedby hand. By removing the hopper L, one or more of the grate-bars C, maybe taken out without disturbing the remaining bars.

Other means than that shown may be employed to impart motion to thehopper L.

\Vhat I claim as my invention and desire to secure by Letters Patent, is

1. In an automatic coal feeder and stoker, a series of detachable,perforated grate-bars, having hoods secured thereto, over the largeropenings, in combination with a bin or receptacle having a movable flooror hopper and the means for reciprocating the same, said hopper beingprovided with a series of air tubes piercing the rear support of thehopper, in the manner substantially as and for the purpose set forth.

2. In an automatic coal feeder and stoker, a series of detachable,perforated and hooded grate-bars, resting at one end on a suitable rodor bar received into a notch or opening in the sides of said grate-bars,in combination with a cam-shaft having cams for agitating the grate-barsand the means for rocking said cam-shaft, in the mannersubstantially asand for the purpose set forth.

3. In an automatic coal feeder and stoker, a series of detachable,perforated and hooded grate-bars supported by a rod or bar forward and acam-shaft for agitating said grate-bars, in the rear, in combinationwith the ash grate I, in the manner substantially as and for the purposeset forth.

4. An automatic coal feeder and stoker consisting of a series ofdetachable, perforated and hooded grate-bars, resting on a bar forwardand a cam-shaft in the rear, an ash grate, the bin and hopper, saidhopper having a series of tubes piercing the rear support thereof, thefloor Z and doors Z, with the mechanism for operating the hopper andcam-shaft, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM OEIILSTROM.

Witnesses:

W. II. BURRIDGE, F. A. CUTTER.

